"In my 13 years of taking walks in the United States, I could remember only ever seeing one native-born American taking a walk." Where in the world does this m

"In my 13 years of taking walks in the United States, I could remember only ever seeing one native-born American taking a walk." Where in the world does this man take walks? Down the median of I-5? I have a hard time coming up with a reason that "taking a walk" must exclude walking the dog; taking with a friend; even chatting on the phone, though that's not my habit. Nor can I see why one may not pass anybody--in a walking part of the world does one end up with large queues of walkers with the tail end going slower and slower? I write this having just walked in to work, a bit less than an hour, right around half an hour slower than riding the bus. Yes it is purposeful, but it is not the most time-efficient way of accomplishing the purpose.